Manufacture of artificial yarn, filaments and the like



Patented Oct. 19, 1937 UNITED STATES MANUFACTURE OF ARTIFICIAL YARN,FILA- MENTS AND THE LIKE Thomas H. Byron,

Elizabethton, Tenn., assignor to North American Rayon Corporation, New

York, N. Y.,

a corporation of Delaware No Drawing. Application October 25, 1934,Serial No. 749,923

8 Claims.

My present invention has to do with a new and novel way of producingcolored and delustred yarn.

In the manufacture of yarn from cellulosic solutions, it is old to addan insoluble pigment to the spinning solution prior to its extrusion toform fibres, filaments, yarn, and the like. For

example, the Singmaster U. S. Patent 1,725,742.

broadly covers the idea of adding an insoluble 10 pigment to yarns inorder to delustre them, while a later Singmaster U. S. Patent 1,875,894refers specifically to the use of titanium dioxide for this purpose.These added compounds tend to reduce the lustre of the yarn, and produceso-called low lustre products.

The tinting of yarn, per se, is also an old expedient, and Lockharts U.S. Patent 1,865,701, for example, indicates that by including coloredmatter in the solution a dyed or colored yarn can be directly produced.

Both of the class of patents just described fulfill their individualfunctions in a, satisfactory manner, but my present invention differsfrom, and is an improvement over these, in that a single compound onlyis added to the spinning solution in order to produce the double resultof both delustring and coloring the resulting yarn. The importance ofthis innovation becomes readily apparent when one considers that greatdiffi- 30 culties with respect to filtering and. spinneret cloggingpresent themselves when any matter is added to a spinning solution.

As a further differentiation, it may be pointed out that in my presentinvention it is not absolutely necessary that the salt added to theviscose, cuprammonium, or other cellulosic solution, be insolubletherein, or impervious to the action of acids and bases.

Mly present invention concerns the use of titanates and metatitanates asingredients which not only delustre but also color the yarn producedfrom the solutions containing these salts.

In the viscose and cuprammonium processes, a small amount varying from0.4 to 4.5% (calculated on the cellulose content) of the titanate ormetatitanate may be finely ground in the customary manner and thoroughlymixed with the solution. In the production of nitrocellulose and organicderivatives of cellulose solutions, the salts may be mixed with eitherthe cellulose per se, the finished solution, or the solvent, in theamounts previously indicated.

As an example I may make use of cobalt titanate or cobalt metatitanate,ordinarily produced by mixing cobalt carbonate with titanium dioxide,

and calcining. A bright green color is imparted to the threads produced,and their lustre is also diminished. By controlling the calciningtemperature various shades of green may be produced.

Vanadium titanates may be employed if an orange-yellow color, or oneapproaching that, is desired. Similarly, iron, nickel, chromium, andother salts may be used to replace the cobalt and thus a variety ofcolors are available.

The salts need not be totally or partially insoluble in thesolutions, orin the following treating media, since, according to one theory, thetitanium salts present tend to produce the oxide which acts as adelustrant. If the salt used is totally impervious to the solution andtreating media employed, the whole salt will act as an ordinaryinsoluble pigment, and both color and delustre the yarn.

In the claims I wish to have the term titanate include also theso-called metatitanate salts.

Having now set forth my invention as required by the patent statutes,What I desire to claim is:

1. A spinning solution for the manufacture of cellulosicproductscomprising a cellulosic solution selected from the groupconsisting of viscose and cuprammonium cellulose containing a finelydivided titanate selected from the group consisting of cobalt, chromium,iron, nickel and vanadium titanates in a sufficient amount to color andsimultaneously deluster the products formed from said solution.

2. A spinning solution for the manufacture of cellulosic productscomprising a cellulosic solution selected from the group consisting ofviscose and cuprammonium cellulose containing a finely divided cobalttitanate in a sufficient amount to color and simultaneously deluster theproducts formed from said solution.

3. A spinning solution for the manufacture of cellulosic productscomprising a cellulosic solution selected from the group consisting ofviscose and cuprammonium cellulose containing a finely divided chromiumtitanate in a sufficient amount to color and simultaneously deluster theproducts formed from said solution. I

4. A spinning solution for the manufacture of cellulosic productscomprising a cellulosic solution selected from the group consisting ofviscose and cuprammonium cellulose containing a finely divided vanadiumtitanate in a suflicient amount to color and simultaneously deluster theproducts formed from said solution.

5. Regenerated cellulose of the group consisting of viscose andcuprammonium cellulose containing a finely divided titanate selectedfrom the group consisting of cobalt, chromium, iron, nickel and vanadiumtitanates, said titanate being present in a sufiicient amount to colorand simultaneously deluster said cellulose.

6. Regenerated cellulose of the group consisting of viscose andcuprammoniumcellulose containing a finely divided cobalt titanate, saidtitanate being present in a suificient amount to 10 color andsimultaneously deluster said cellulose;

7. Regenerated cellulose of the group consistt H THOMAS H. BYRON.

